map遍历的几种方法

Posted 2020-06-18 maozs

1、变量遍历键值对的三种方法：

	public static void iterate1(Map<String, String> map) {
		Iterator<java.util.Map.Entry<String, String>> iterator = map.entrySet().iterator();
		while (iterator.hasNext()) {
			java.util.Map.Entry<String, String> entry = iterator.next();
			System.out.println(entry.getKey() + ":" + entry.getValue());
		}
	}

	public static void iterate2(Map<String, String> map) {
		Set<String> set = map.keySet();
		for (String key : set) {
			System.out.println(key + ":" + map.get(key));
		}
	}
	
	public static void iterate3(Map<String,String> map){
		Set<java.util.Map.Entry<String,String>> set= map.entrySet();
		for (java.util.Map.Entry<String, String> entry : set) {
			System.out.println(entry.getKey()+":"+entry.getValue());
		}
	}

2、只遍历值的一种方法

	public static void iterate4(Map<String, String> map) {
		for (String value : map.values()) {
			System.out.println(value);
		}
	}